745 lines
28 KiB
C
745 lines
28 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "extract-word.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "hashmap.h"
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#include "libmount-util.h"
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "set.h"
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#include "stat-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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int mount_fd(const char *source,
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int target_fd,
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const char *filesystemtype,
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unsigned long mountflags,
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const void *data) {
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char path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
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xsprintf(path, "/proc/self/fd/%i", target_fd);
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if (mount(source, path, filesystemtype, mountflags, data) < 0) {
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if (errno != ENOENT)
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return -errno;
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/* ENOENT can mean two things: either that the source is missing, or that /proc/ isn't
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* mounted. Check for the latter to generate better error messages. */
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if (proc_mounted() == 0)
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return -ENOSYS;
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return -ENOENT;
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}
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return 0;
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}
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int mount_nofollow(
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const char *source,
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const char *target,
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const char *filesystemtype,
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unsigned long mountflags,
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const void *data) {
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_cleanup_close_ int fd = -1;
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/* In almost all cases we want to manipulate the mount table without following symlinks, hence
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* mount_nofollow() is usually the way to go. The only exceptions are environments where /proc/ is
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* not available yet, since we need /proc/self/fd/ for this logic to work. i.e. during the early
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* initialization of namespacing/container stuff where /proc is not yet mounted (and maybe even the
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* fs to mount) we can only use traditional mount() directly.
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*
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* Note that this disables following only for the final component of the target, i.e symlinks within
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* the path of the target are honoured, as are symlinks in the source path everywhere. */
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fd = open(target, O_PATH|O_CLOEXEC|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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return mount_fd(source, fd, filesystemtype, mountflags, data);
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}
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int umount_recursive(const char *prefix, int flags) {
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int n = 0, r;
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bool again;
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/* Try to umount everything recursively below a
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* directory. Also, take care of stacked mounts, and keep
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* unmounting them until they are gone. */
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do {
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_cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
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_cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
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again = false;
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r = libmount_parse("/proc/self/mountinfo", NULL, &table, &iter);
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if (r < 0)
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return log_debug_errno(r, "Failed to parse /proc/self/mountinfo: %m");
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for (;;) {
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struct libmnt_fs *fs;
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const char *path;
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r = mnt_table_next_fs(table, iter, &fs);
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if (r == 1)
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break;
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if (r < 0)
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return log_debug_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
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path = mnt_fs_get_target(fs);
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if (!path)
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continue;
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if (!path_startswith(path, prefix))
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continue;
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if (umount2(path, flags | UMOUNT_NOFOLLOW) < 0) {
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log_debug_errno(errno, "Failed to umount %s, ignoring: %m", path);
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continue;
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}
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log_debug("Successfully unmounted %s", path);
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again = true;
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n++;
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break;
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}
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} while (again);
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return n;
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}
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static int get_mount_flags(
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struct libmnt_table *table,
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const char *path,
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unsigned long *ret) {
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_cleanup_close_ int fd = -1;
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struct libmnt_fs *fs;
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struct statvfs buf;
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const char *opts;
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int r;
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/* Get the mount flags for the mountpoint at "path" from "table". We have a fallback using statvfs()
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* in place (which provides us with mostly the same info), but it's just a fallback, since using it
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* means triggering autofs or NFS mounts, which we'd rather avoid needlessly.
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*
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* This generally doesn't follow symlinks. */
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fs = mnt_table_find_target(table, path, MNT_ITER_FORWARD);
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if (!fs) {
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log_debug("Could not find '%s' in mount table, ignoring.", path);
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goto fallback;
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}
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opts = mnt_fs_get_vfs_options(fs);
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if (!opts) {
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*ret = 0;
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return 0;
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}
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r = mnt_optstr_get_flags(opts, ret, mnt_get_builtin_optmap(MNT_LINUX_MAP));
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if (r != 0) {
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log_debug_errno(r, "Could not get flags for '%s', ignoring: %m", path);
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goto fallback;
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}
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/* MS_RELATIME is default and trying to set it in an unprivileged container causes EPERM */
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*ret &= ~MS_RELATIME;
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return 0;
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fallback:
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fd = open(path, O_PATH|O_CLOEXEC|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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if (fstatvfs(fd, &buf) < 0)
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return -errno;
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/* The statvfs() flags and the mount flags mostly have the same values, but for some cases do
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* not. Hence map the flags manually. (Strictly speaking, ST_RELATIME/MS_RELATIME is the most
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* prominent one that doesn't match, but that's the one we mask away anyway, see above.) */
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*ret =
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FLAGS_SET(buf.f_flag, ST_RDONLY) * MS_RDONLY |
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FLAGS_SET(buf.f_flag, ST_NODEV) * MS_NODEV |
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FLAGS_SET(buf.f_flag, ST_NOEXEC) * MS_NOEXEC |
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FLAGS_SET(buf.f_flag, ST_NOSUID) * MS_NOSUID |
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FLAGS_SET(buf.f_flag, ST_NOATIME) * MS_NOATIME |
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FLAGS_SET(buf.f_flag, ST_NODIRATIME) * MS_NODIRATIME;
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return 0;
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}
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/* Use this function only if you do not have direct access to /proc/self/mountinfo but the caller can open it
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* for you. This is the case when /proc is masked or not mounted. Otherwise, use bind_remount_recursive. */
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int bind_remount_recursive_with_mountinfo(
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const char *prefix,
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unsigned long new_flags,
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unsigned long flags_mask,
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char **deny_list,
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FILE *proc_self_mountinfo) {
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_cleanup_set_free_free_ Set *done = NULL;
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_cleanup_free_ char *simplified = NULL;
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int r;
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assert(prefix);
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assert(proc_self_mountinfo);
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/* Recursively remount a directory (and all its submounts) read-only or read-write. If the directory is already
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* mounted, we reuse the mount and simply mark it MS_BIND|MS_RDONLY (or remove the MS_RDONLY for read-write
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* operation). If it isn't we first make it one. Afterwards we apply MS_BIND|MS_RDONLY (or remove MS_RDONLY) to
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* all submounts we can access, too. When mounts are stacked on the same mount point we only care for each
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* individual "top-level" mount on each point, as we cannot influence/access the underlying mounts anyway. We
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* do not have any effect on future submounts that might get propagated, they might be writable. This includes
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* future submounts that have been triggered via autofs.
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*
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* If the "deny_list" parameter is specified it may contain a list of subtrees to exclude from the
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* remount operation. Note that we'll ignore the deny list for the top-level path. */
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simplified = strdup(prefix);
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if (!simplified)
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return -ENOMEM;
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path_simplify(simplified, false);
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done = set_new(&path_hash_ops);
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if (!done)
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return -ENOMEM;
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for (;;) {
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_cleanup_set_free_free_ Set *todo = NULL;
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_cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
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_cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
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bool top_autofs = false;
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char *x;
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unsigned long orig_flags;
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todo = set_new(&path_hash_ops);
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if (!todo)
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return -ENOMEM;
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rewind(proc_self_mountinfo);
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r = libmount_parse("/proc/self/mountinfo", proc_self_mountinfo, &table, &iter);
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if (r < 0)
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return log_debug_errno(r, "Failed to parse /proc/self/mountinfo: %m");
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for (;;) {
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struct libmnt_fs *fs;
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const char *path, *type;
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r = mnt_table_next_fs(table, iter, &fs);
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if (r == 1)
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break;
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if (r < 0)
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return log_debug_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
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path = mnt_fs_get_target(fs);
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type = mnt_fs_get_fstype(fs);
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if (!path || !type)
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continue;
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if (!path_startswith(path, simplified))
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continue;
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/* Ignore this mount if it is deny-listed, but only if it isn't the top-level mount
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* we shall operate on. */
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if (!path_equal(path, simplified)) {
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bool deny_listed = false;
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char **i;
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STRV_FOREACH(i, deny_list) {
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if (path_equal(*i, simplified))
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continue;
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if (!path_startswith(*i, simplified))
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continue;
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if (path_startswith(path, *i)) {
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deny_listed = true;
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log_debug("Not remounting %s deny-listed by %s, called for %s",
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path, *i, simplified);
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break;
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}
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}
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if (deny_listed)
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continue;
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}
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/* Let's ignore autofs mounts. If they aren't
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* triggered yet, we want to avoid triggering
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* them, as we don't make any guarantees for
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* future submounts anyway. If they are
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* already triggered, then we will find
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* another entry for this. */
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if (streq(type, "autofs")) {
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top_autofs = top_autofs || path_equal(path, simplified);
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continue;
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}
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if (!set_contains(done, path)) {
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r = set_put_strdup(&todo, path);
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if (r < 0)
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return r;
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}
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}
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/* If we have no submounts to process anymore and if
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* the root is either already done, or an autofs, we
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* are done */
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if (set_isempty(todo) &&
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(top_autofs || set_contains(done, simplified)))
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return 0;
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if (!set_contains(done, simplified) &&
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!set_contains(todo, simplified)) {
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/* The prefix directory itself is not yet a mount, make it one. */
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r = mount_nofollow(simplified, simplified, NULL, MS_BIND|MS_REC, NULL);
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if (r < 0)
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return r;
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orig_flags = 0;
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(void) get_mount_flags(table, simplified, &orig_flags);
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r = mount_nofollow(NULL, simplified, NULL, (orig_flags & ~flags_mask)|MS_BIND|MS_REMOUNT|new_flags, NULL);
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if (r < 0)
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return r;
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log_debug("Made top-level directory %s a mount point.", prefix);
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r = set_put_strdup(&done, simplified);
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if (r < 0)
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return r;
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}
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while ((x = set_steal_first(todo))) {
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r = set_consume(done, x);
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if (IN_SET(r, 0, -EEXIST))
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continue;
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if (r < 0)
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return r;
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/* Deal with mount points that are obstructed by a later mount */
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r = path_is_mount_point(x, NULL, 0);
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if (IN_SET(r, 0, -ENOENT))
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continue;
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if (r < 0) {
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if (!ERRNO_IS_PRIVILEGE(r))
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return r;
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/* Even if root user invoke this, submounts under private FUSE or NFS mount points
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* may not be acceessed. E.g.,
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*
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* $ bindfs --no-allow-other ~/mnt/mnt ~/mnt/mnt
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* $ bindfs --no-allow-other ~/mnt ~/mnt
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*
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* Then, root user cannot access the mount point ~/mnt/mnt.
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* In such cases, the submounts are ignored, as we have no way to manage them. */
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log_debug_errno(r, "Failed to determine '%s' is mount point or not, ignoring: %m", x);
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continue;
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}
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/* Try to reuse the original flag set */
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orig_flags = 0;
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(void) get_mount_flags(table, x, &orig_flags);
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r = mount_nofollow(NULL, x, NULL, (orig_flags & ~flags_mask)|MS_BIND|MS_REMOUNT|new_flags, NULL);
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if (r < 0)
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return r;
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log_debug("Remounted %s read-only.", x);
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}
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}
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}
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int bind_remount_recursive(
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const char *prefix,
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unsigned long new_flags,
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unsigned long flags_mask,
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char **deny_list) {
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_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
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int r;
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r = fopen_unlocked("/proc/self/mountinfo", "re", &proc_self_mountinfo);
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if (r < 0)
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return r;
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return bind_remount_recursive_with_mountinfo(prefix, new_flags, flags_mask, deny_list, proc_self_mountinfo);
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}
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int bind_remount_one_with_mountinfo(
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const char *path,
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unsigned long new_flags,
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unsigned long flags_mask,
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FILE *proc_self_mountinfo) {
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_cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
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unsigned long orig_flags = 0;
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int r;
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assert(path);
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assert(proc_self_mountinfo);
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rewind(proc_self_mountinfo);
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table = mnt_new_table();
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if (!table)
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return -ENOMEM;
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r = mnt_table_parse_stream(table, proc_self_mountinfo, "/proc/self/mountinfo");
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if (r < 0)
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return r;
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/* Try to reuse the original flag set */
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(void) get_mount_flags(table, path, &orig_flags);
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r = mount_nofollow(NULL, path, NULL, (orig_flags & ~flags_mask)|MS_BIND|MS_REMOUNT|new_flags, NULL);
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if (r < 0)
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return r;
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return 0;
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}
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int mount_move_root(const char *path) {
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assert(path);
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if (chdir(path) < 0)
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return -errno;
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if (mount(path, "/", NULL, MS_MOVE, NULL) < 0)
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return -errno;
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if (chroot(".") < 0)
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return -errno;
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if (chdir("/") < 0)
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return -errno;
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return 0;
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}
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int repeat_unmount(const char *path, int flags) {
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bool done = false;
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assert(path);
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/* If there are multiple mounts on a mount point, this
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* removes them all */
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for (;;) {
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if (umount2(path, flags) < 0) {
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if (errno == EINVAL)
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return done;
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return -errno;
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}
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done = true;
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}
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}
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int mode_to_inaccessible_node(
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const char *runtime_dir,
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mode_t mode,
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char **ret) {
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/* This function maps a node type to a corresponding inaccessible file node. These nodes are created
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* during early boot by PID 1. In some cases we lacked the privs to create the character and block
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* devices (maybe because we run in an userns environment, or miss CAP_SYS_MKNOD, or run with a
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* devices policy that excludes device nodes with major and minor of 0), but that's fine, in that
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* case we use an AF_UNIX file node instead, which is not the same, but close enough for most
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* uses. And most importantly, the kernel allows bind mounts from socket nodes to any non-directory
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* file nodes, and that's the most important thing that matters.
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*
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* Note that the runtime directory argument shall be the top-level runtime directory, i.e. /run/ if
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* we operate in system context and $XDG_RUNTIME_DIR if we operate in user context. */
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_cleanup_free_ char *d = NULL;
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const char *node = NULL;
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assert(ret);
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if (!runtime_dir)
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runtime_dir = "/run";
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switch(mode & S_IFMT) {
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case S_IFREG:
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node = "/systemd/inaccessible/reg";
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break;
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case S_IFDIR:
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node = "/systemd/inaccessible/dir";
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break;
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case S_IFCHR:
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node = "/systemd/inaccessible/chr";
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break;
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case S_IFBLK:
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node = "/systemd/inaccessible/blk";
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break;
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case S_IFIFO:
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node = "/systemd/inaccessible/fifo";
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break;
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case S_IFSOCK:
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node = "/systemd/inaccessible/sock";
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break;
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}
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if (!node)
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return -EINVAL;
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d = path_join(runtime_dir, node);
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if (!d)
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return -ENOMEM;
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/* On new kernels unprivileged users are permitted to create 0:0 char device nodes (because they also
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* act as whiteout inode for overlayfs), but no other char or block device nodes. On old kernels no
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* device node whatsoever may be created by unprivileged processes. Hence, if the caller asks for the
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* inaccessible block device node let's see if the block device node actually exists, and if not,
|
|
* fall back to the character device node. From there fall back to the socket device node. This means
|
|
* in the best case we'll get the right device node type — but if not we'll hopefully at least get a
|
|
* device node at all. */
|
|
|
|
if (S_ISBLK(mode) &&
|
|
access(d, F_OK) < 0 && errno == ENOENT) {
|
|
free(d);
|
|
d = path_join(runtime_dir, "/systemd/inaccessible/chr");
|
|
if (!d)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (IN_SET(mode & S_IFMT, S_IFBLK, S_IFCHR) &&
|
|
access(d, F_OK) < 0 && errno == ENOENT) {
|
|
free(d);
|
|
d = path_join(runtime_dir, "/systemd/inaccessible/sock");
|
|
if (!d)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*ret = TAKE_PTR(d);
|
|
return 0;
|
|
}
|
|
|
|
#define FLAG(name) (flags & name ? STRINGIFY(name) "|" : "")
|
|
static char* mount_flags_to_string(long unsigned flags) {
|
|
char *x;
|
|
_cleanup_free_ char *y = NULL;
|
|
long unsigned overflow;
|
|
|
|
overflow = flags & ~(MS_RDONLY |
|
|
MS_NOSUID |
|
|
MS_NODEV |
|
|
MS_NOEXEC |
|
|
MS_SYNCHRONOUS |
|
|
MS_REMOUNT |
|
|
MS_MANDLOCK |
|
|
MS_DIRSYNC |
|
|
MS_NOATIME |
|
|
MS_NODIRATIME |
|
|
MS_BIND |
|
|
MS_MOVE |
|
|
MS_REC |
|
|
MS_SILENT |
|
|
MS_POSIXACL |
|
|
MS_UNBINDABLE |
|
|
MS_PRIVATE |
|
|
MS_SLAVE |
|
|
MS_SHARED |
|
|
MS_RELATIME |
|
|
MS_KERNMOUNT |
|
|
MS_I_VERSION |
|
|
MS_STRICTATIME |
|
|
MS_LAZYTIME);
|
|
|
|
if (flags == 0 || overflow != 0)
|
|
if (asprintf(&y, "%lx", overflow) < 0)
|
|
return NULL;
|
|
|
|
x = strjoin(FLAG(MS_RDONLY),
|
|
FLAG(MS_NOSUID),
|
|
FLAG(MS_NODEV),
|
|
FLAG(MS_NOEXEC),
|
|
FLAG(MS_SYNCHRONOUS),
|
|
FLAG(MS_REMOUNT),
|
|
FLAG(MS_MANDLOCK),
|
|
FLAG(MS_DIRSYNC),
|
|
FLAG(MS_NOATIME),
|
|
FLAG(MS_NODIRATIME),
|
|
FLAG(MS_BIND),
|
|
FLAG(MS_MOVE),
|
|
FLAG(MS_REC),
|
|
FLAG(MS_SILENT),
|
|
FLAG(MS_POSIXACL),
|
|
FLAG(MS_UNBINDABLE),
|
|
FLAG(MS_PRIVATE),
|
|
FLAG(MS_SLAVE),
|
|
FLAG(MS_SHARED),
|
|
FLAG(MS_RELATIME),
|
|
FLAG(MS_KERNMOUNT),
|
|
FLAG(MS_I_VERSION),
|
|
FLAG(MS_STRICTATIME),
|
|
FLAG(MS_LAZYTIME),
|
|
y);
|
|
if (!x)
|
|
return NULL;
|
|
if (!y)
|
|
x[strlen(x) - 1] = '\0'; /* truncate the last | */
|
|
return x;
|
|
}
|
|
|
|
int mount_verbose_full(
|
|
int error_log_level,
|
|
const char *what,
|
|
const char *where,
|
|
const char *type,
|
|
unsigned long flags,
|
|
const char *options,
|
|
bool follow_symlink) {
|
|
|
|
_cleanup_free_ char *fl = NULL, *o = NULL;
|
|
unsigned long f;
|
|
int r;
|
|
|
|
r = mount_option_mangle(options, flags, &f, &o);
|
|
if (r < 0)
|
|
return log_full_errno(error_log_level, r,
|
|
"Failed to mangle mount options %s: %m",
|
|
strempty(options));
|
|
|
|
fl = mount_flags_to_string(f);
|
|
|
|
if ((f & MS_REMOUNT) && !what && !type)
|
|
log_debug("Remounting %s (%s \"%s\")...",
|
|
where, strnull(fl), strempty(o));
|
|
else if (!what && !type)
|
|
log_debug("Mounting %s (%s \"%s\")...",
|
|
where, strnull(fl), strempty(o));
|
|
else if ((f & MS_BIND) && !type)
|
|
log_debug("Bind-mounting %s on %s (%s \"%s\")...",
|
|
what, where, strnull(fl), strempty(o));
|
|
else if (f & MS_MOVE)
|
|
log_debug("Moving mount %s → %s (%s \"%s\")...",
|
|
what, where, strnull(fl), strempty(o));
|
|
else
|
|
log_debug("Mounting %s (%s) on %s (%s \"%s\")...",
|
|
strna(what), strna(type), where, strnull(fl), strempty(o));
|
|
|
|
if (follow_symlink)
|
|
r = mount(what, where, type, f, o) < 0 ? -errno : 0;
|
|
else
|
|
r = mount_nofollow(what, where, type, f, o);
|
|
if (r < 0)
|
|
return log_full_errno(error_log_level, r,
|
|
"Failed to mount %s (type %s) on %s (%s \"%s\"): %m",
|
|
strna(what), strna(type), where, strnull(fl), strempty(o));
|
|
return 0;
|
|
}
|
|
|
|
int umount_verbose(
|
|
int error_log_level,
|
|
const char *what,
|
|
int flags) {
|
|
|
|
assert(what);
|
|
|
|
log_debug("Umounting %s...", what);
|
|
|
|
if (umount2(what, flags) < 0)
|
|
return log_full_errno(error_log_level, errno,
|
|
"Failed to unmount %s: %m", what);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mount_option_mangle(
|
|
const char *options,
|
|
unsigned long mount_flags,
|
|
unsigned long *ret_mount_flags,
|
|
char **ret_remaining_options) {
|
|
|
|
const struct libmnt_optmap *map;
|
|
_cleanup_free_ char *ret = NULL;
|
|
const char *p;
|
|
int r;
|
|
|
|
/* This extracts mount flags from the mount options, and store
|
|
* non-mount-flag options to '*ret_remaining_options'.
|
|
* E.g.,
|
|
* "rw,nosuid,nodev,relatime,size=1630748k,mode=700,uid=1000,gid=1000"
|
|
* is split to MS_NOSUID|MS_NODEV|MS_RELATIME and
|
|
* "size=1630748k,mode=700,uid=1000,gid=1000".
|
|
* See more examples in test-mount-utils.c.
|
|
*
|
|
* Note that if 'options' does not contain any non-mount-flag options,
|
|
* then '*ret_remaining_options' is set to NULL instead of empty string.
|
|
* Note that this does not check validity of options stored in
|
|
* '*ret_remaining_options'.
|
|
* Note that if 'options' is NULL, then this just copies 'mount_flags'
|
|
* to '*ret_mount_flags'. */
|
|
|
|
assert(ret_mount_flags);
|
|
assert(ret_remaining_options);
|
|
|
|
map = mnt_get_builtin_optmap(MNT_LINUX_MAP);
|
|
if (!map)
|
|
return -EINVAL;
|
|
|
|
p = options;
|
|
for (;;) {
|
|
_cleanup_free_ char *word = NULL;
|
|
const struct libmnt_optmap *ent;
|
|
|
|
r = extract_first_word(&p, &word, ",", EXTRACT_UNQUOTE);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
break;
|
|
|
|
for (ent = map; ent->name; ent++) {
|
|
/* All entries in MNT_LINUX_MAP do not take any argument.
|
|
* Thus, ent->name does not contain "=" or "[=]". */
|
|
if (!streq(word, ent->name))
|
|
continue;
|
|
|
|
if (!(ent->mask & MNT_INVERT))
|
|
mount_flags |= ent->id;
|
|
else if (mount_flags & ent->id)
|
|
mount_flags ^= ent->id;
|
|
|
|
break;
|
|
}
|
|
|
|
/* If 'word' is not a mount flag, then store it in '*ret_remaining_options'. */
|
|
if (!ent->name && !strextend_with_separator(&ret, ",", word))
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*ret_mount_flags = mount_flags;
|
|
*ret_remaining_options = TAKE_PTR(ret);
|
|
|
|
return 0;
|
|
}
|